diff --git a/mozilla/tools/tinderbox-configs/lightning/macosx/mozconfig b/mozilla/tools/tinderbox-configs/lightning/macosx/mozconfig
index cede05502c5..9913fc2e675 100755
--- a/mozilla/tools/tinderbox-configs/lightning/macosx/mozconfig
+++ b/mozilla/tools/tinderbox-configs/lightning/macosx/mozconfig
@@ -12,6 +12,6 @@ ac_add_options --disable-static
 ac_add_options --enable-shared
 ac_add_options --disable-tests
 ac_add_options --disable-debug
-ac_add_options --with-macos-sdk=/Developer/SDKs/MacOSX10.2.8.sdk
+ac_add_options --with-macos-sdk=/Developer/SDKs/MacOSX10.3.9.sdk
 # Use Carbon widgets, regardless of what trunk's default is
 ac_add_options --enable-default-toolkit=mac
diff --git a/mozilla/tools/tinderbox-configs/sunbird/macosx/mozconfig b/mozilla/tools/tinderbox-configs/sunbird/macosx/mozconfig
index 31ff18ae39d..9cc3cc1c700 100755
--- a/mozilla/tools/tinderbox-configs/sunbird/macosx/mozconfig
+++ b/mozilla/tools/tinderbox-configs/sunbird/macosx/mozconfig
@@ -15,7 +15,7 @@ ac_add_options --disable-shared
 ac_add_options --disable-installer
 ac_add_options --disable-tests
 ac_add_options --enable-prebinding
-ac_add_options --with-macos-sdk=/Developer/SDKs/MacOSX10.2.8.sdk
+ac_add_options --with-macos-sdk=/Developer/SDKs/MacOSX10.3.9.sdk
 # Use Carbon widgets, regardless of what trunk's default is
 ac_add_options --enable-default-toolkit=mac
 # SVG now requires Cairo, so disable it for now.